Abstract: Since the end of the fifth century AH and the eleventh century AD, the Islamic Levant witnessed a major historical event, which was the Crusader aggression against large parts of the Islamic countries. Within a few years, the Crusaders were able to seize a number of Islamic cities and villages, where they established four main Crusader entities: (Edessa, Antioch, Tripoli, and Jerusalem). This was in a short period of time. This event was a very great shock to the Muslims, the most important reason for which was that the world… Islam was going through a stage of internal rupture as a result of the conflicts that broke out between the Islamic forces, whether it was the Abbasid Caliphate, the Seljuk state, the Fatimid Caliphate, and some of the Atabegs, Ayyubids, and Mamluks later.

Keywords: Alliances, Islamic, negative, politics, Ayyubid, just.